JPH09315373A - Automatic speed change gear for bicycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove the troublesomeness of a gear shift by varying the diameter of the crank gear of a bicycle for carrying out continuously variable automatic speed change. SOLUTION: A spring attaching board 5 is fixed to a crank shaft for fixing a spring 2 to the spring attaching board 5. One side of the spring 2 is provided with a split gear 3. The load of a chain or a belt is utilized to give variation to the spring 2 for telescopically varying an interval between the split gears 3 and 3, and the diameter of the gear is thereby varied for carrying out continuously variable automatic speed change.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a device for eliminating the trouble of gear shifting by continuously changing the diameter of a crank gear of a bicycle and automatically shifting the gears.

[0002]

2. Description of the Related Art Conventionally, when a bicycle comes uphill, it loses its inertia and requires leg power. Therefore, a gearbox is required, but gear shifting is troublesome. There was a shock and a difficulty in meshing when shifting. There is also automatic shifting, but a complicated mechanism such as a speed sensor was required. There was a wait because the speed change system using the speed sensor does not change speed unless the speed reaches a certain level.

[0003]

[Problems to be solved by the invention] Therefore, I want to change gears according to the situation, but I want the top right now, but since I will climb uphill soon, I was rowing at low speed,
On the other hand, I would like to go low on an uphill slope now, but as soon as this time passes, I was able to hold on to the top because it was flat. There were many steps, but in the end, I rode most at a reasonable position and changed to low when the uphill continued. In order to eliminate this trouble, the crank gear is divided into several split gears, which are provided on one side of the spring, and the other side of the spring is fixed to the spring mounting plate fixed to the crankshaft, and the chain or belt If the pedal becomes heavy when the load is received by the spring's repulsive force, when going uphill, starting, or accelerating, it becomes a low gear. When stopped
Go downhill, run on level ground and become a top gear when the pedals lighten. Simple mechanism that does not require complicated mechanism, speed sensor, etc.
It was invented to automatically change infinitely according to the situation with a simple action.

[0004]

[Means for Solving the Problems]

The structure will now be described. The spring mounting plate (5) is fixed to the crankshaft. The spring (2) is fixed to the spring mounting plate (5) fixed to the crankshaft. (C) Provide the split gear (3) on the spring (2) fixed to the spring mounting board (5). Secure the belt fall prevention board (4) to the spring mounting board (5). The belt (1) is attached to the split gear (3) provided on the spring (2).
multiply. The present invention is an automatic transmission having the above-mentioned mechanism.

[0005]

Next, the operation of the present invention will be described with reference to FIG. (2). The split gear (3) and the split gear (3) are generated by the repulsive force of the spring (2) when the load is 0 to when the load is small or when traveling on a flat ground.
In the state of (a) where the diameter of the spread gear is increased during the interval, the spring (2) is pressed through the split gear (3) by the load of the belt or chain (1) during acceleration or starting, ) And spring (2) at the maximum load such as uphill
Beyond the limit of the repulsive force of the belt, the gap between the split gear (3) and the split gear (3) stuck to the spring mounting plate (5) disappears and the belt (1) becomes a circle with the smallest deformation that exerts the most force. ) And the split gear (3) separate from each other, the repulsive force of the spring (2) returns to the top position, and the belt (1) and the split gear (3) start meshing at the top position at the same time as the meshing of the belt (1). Depending on the load received, the spring (2) changes according to the load, and the repulsive force of the spring (2) flexibly changes from top to low. When the crank gear becomes smaller, the belt becomes slack, and the slack prevention device (6) moves according to the slack to remove the slack. From (a) to (c) The load of the chain or belt (1) is received by the split gear (3), and the repulsive force of the spring (2) that follows it is used to change the situation from low to top without any operation. In addition, it was designed so that it could change instantly, smoothly, and infinitely and continuously.

[0006]

[Embodiment] The gear is automatically changed by the change of the spring depending on the load applied to the crank, but the hardness of the spring is adjusted so that it does not change when the load is small or the load is flat, and from there, it gradually changes as the load increases and the most force is applied. Adjust the stiffness of the spring (2) to be a roger where it is needed. Further, as shown in FIG. 3, the belt drop prevention board (4) is fixed to the crankshaft, and the octagonal plate (8) and the belt drop prevention board (4) are fixed to both ends of the coil spring (7) so that the belt drop prevention board ( The split gear (3) moves up and down along the groove of (4) and the diameter of the gear changes from large to small, whereby automatic gear shifting can be performed. This is also that the octagonal plate (8) with the split gear mounting plate (9) fixed by pushing down the split gear (3) by the load of the chain or belt (1) slides on the crankshaft while pulling the coil spring (7). The load is applied to the coil spring (7) covered by the crankshaft, and the split gear mounting plate (9) opens or collapses according to the load of the belt to change the diameter of the gear and automatically shift. When this method is used, the gear draws a perfect circle, and at the maximum load, there is no gap between the split gear (3) and the split gear (3), and the gear is a perfect circle and rotation is smooth. The above-described device may be used to perform continuously variable automatic transmission.

[0007]

[Effects of the Invention] Therefore, in a place where the greatest force is required, the space between the split gears is contracted, the diameter of the gear is reduced, and the gear becomes a low gear. I couldn't handle the situation, I didn't do any operation, I just kept rowing, and I could change from low to top quickly and smoothly according to the situation.Therefore, I didn't have to change manually. You can ride at ease.

[Brief description of drawings]

FIG. 1 is a perspective view in which a part of the present invention is cut away.

FIG. 2 is a front view of the present invention.

FIG. 3 is a front view and a perspective view showing an embodiment of the present invention.

[Explanation of symbols]

 (1) is a belt or chain (2) is a spring (3) is a split gear (4) is a belt fallout prevention plate (5) is a spring mounting plate (6) is a belt slack prevention device (7) is a coil spring (8) Is an octagonal plate that slides on the crankshaft (9) is a split gear mounting plate

Claims (1)

[Claims] (A) A split gear (3) is provided by dividing the gear into several parts. (B) A spring mounting board (5) for fixing to the crankshaft is provided. (C) The spring (2) is fixed to the spring mounting board (5). (D) The split gear (3) is provided on one side of the spring (2). The spring (2) receives a load through the split gear (3) by the load of the chain or the belt (1), and the repulsive force of the spring (2) expands and contracts between the split gear (3) and the split gear (3). The diameter of the crank gear is changed to reduce the load on the pedal, and automatic shifting is performed continuously. The device configured as described above.